/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */

package org.apache.isis.viewer.html.monitoring.servermonitor;

import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;

import org.apache.isis.core.commons.debug.DebuggableWithTitle;

public class Monitor {
    private static final Logger LOG = Logger.getLogger(Monitor.class);
    private static List<MonitorListener> listeners = new ArrayList<MonitorListener>();

    public static void addListener(final MonitorListener listener) {
        listeners.add(listener);
    }

    public static void removeListener(final MonitorListener listener) {
        listeners.remove(listener);
    }

    public static void addEvent(final String category, final String message) {
        addEvent(category, message, null);
    }

    public static void addEvent(final String category, final String message, final DebuggableWithTitle[] debug) {
        final MonitorEvent event = new MonitorEvent(category, message, debug);
        LOG.info(event);
        dispatchEvent(event);
    }

    private static void dispatchEvent(final MonitorEvent event) {
        for (final MonitorListener listener : listeners) {
            listener.postEvent(event);
        }
    }
}
